Thats because parameter 10 is for Power Reports. Parameter 12 is for Energy Reports. You need to set both to 0 to disable both Power (W) AND Energy (KwH) reports
I would expect those settings to send a report every hour (3600 seconds).
Parameters 18 and 20 tell it to send a (power or energy) report if things change by a certain percentage. A value of 0 should disable the respective report that was triggered by a change in percentage of either power (param18) or energy (param20)
However, Parameter 19 tells it to send ‘periodic’ reports which happens whether the value has changed or not. Disabling the percentage-change report does not necessarily disable the periodic report. If you want them all disabled I would think they should all be set to 0.
With that said, my personal bias would be to set them all to the max 100/32767/100 so that you do get something once in a while to keep the database updated but they should be very few and far between.
I do have parameter 12 set to 0, I also have parameter 10 set to 0. Either way on the LZW30-SN, it doesn’t matter how you set it (at least on firmware 1.21), the moment you turn on/off the switch, it reports useage. It could be seconds later, or hours later. It doesn’t respect the settings. I also have a feeling it won’t matter if I set parameter 11 to 0 or 32767, it will still report when switched on/off. (edit, I checked. It doesn’t matter if parameter 11 is set to 32767, it still reports the moment the light is switched on/off regardless of time between switching)
As for the LZW31-SN, Parameter 18 and 20 works as expected. No power reports at all when switched on or off. As for parameter 19 being set to 3600 to send periodic reports, as far as I can tell in my HA history, it hasn’t received a report in 2 days, which is when I changed 18 and 20 to 0. Granted I’m not looking at the actual z-wave logs to see if it’s reporting every hour, but a report sent every hour as opposed to every time the switch is turned on/off is acceptable to me if I really don’t care for power reporting.
I was troubleshooting a Zwave issue on SmartThings and discovered while watching live logging that at least some of my Inovelli switches were flooding with power reports. I changed parameters as follows. I don’t know if this will kill the power reporting, but it certainly stopped the flooding.